A refugium. Good way manage nitrates/phosphates in your aquarium. I have completely stopped using GFO.
Some people (like myself) swear by it. Others hate it. I think that realistically you need a fairly large volume of it to make measurable differences. I have a 55 gallon full, so its quite large.
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They call it addiction for a reason...
Last edited by FishyFishy!; 08-22-2015 at 12:54 AM.
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